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Too small to do much - the CFM of that turbo is pretty low. It will spool very quickly and give a boost to low-end torque, etc but it will likely run out of air-flow at higher RPM. A better choice would be a VF11 from a first-gen Legacy turbo or even a TD04 from a WRX.

Would be great for a Justy, I think. Not so great for a 2.5ltr, which is twice a big. However, if you choose to go this route, be sure you have a good intercooler. If you keep your exhaust gas temperatures in check, then your low end would be great but your top end would probably suffer a little.